Survivors of a sinking ship are rescued by Captain Nemo and his submarine crew. They are taken to an underwater city where they may spend the rest of their lives.

A lord returns to his manor with his new wife, to hear rumours that he had already secretly returned and had committed several murders. Has he lost his mind, or…

Marine atomic tests cause changes in the ocean’s ecosystem resulting in dangerous blobs of radiation and the resurrection of a dormant dinosaur which threatens London.